i965/draw: Use the correct buffer index for interleaved VBO sizes
i965/draw: Use the correct buffer index for interleaved VBO sizes

The buffer_range_* arrays are indexed by buffer index not element index.

Reviewed-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler